Cloth-cutting machine.



A` RUBIN.

CLOTH CUTTING MACHINE. APPLICATION man MARA. 2o. 1915.

1,228,826. Patented Jun-g 5, 1917.

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ADoLrH RUBIN, or s'r.l Leurs, MIssoUnI.

CLOTH-CUTTIG MACHINE.

Application filed March 20, 1916. Serial No. 85,310A

To all whom it may concern:

Be it known .that I, AuoLrI-IRUBIN, a citizen of the United States, and resident of St. Louis, Missouri, have invented certain new and useful Improvements in Cloth- Cutting Machines, of which the following is a specification containing a full, clear, and

eXactdescription,'reference being had'to the accompanying drawings, forming a part hereof.

My invention relates to an improved portable cloth-cutting machine, and consists in the novel construction and arrangement of parts hereinafterl described and specifically pointed out in the appended claims.

The principal object of my invention is to provide a simple, efficient, and relatively cheap rmechanism for converting the rotary motion of the motor to a reciprocating motion, as required in cloth-cutting machines of the class which employ a reciprocating knife. n

A further object is to provide a vertical power shaft, such as the armature-shaft -of a vertical electric-motor, and simple and efficient mechanism for converting the rotary motion of said vertical shaft into the required reciprocating motion to drive a vertically-reciprocating knife directly from the lower end of said vertical armature-shaft, without the use of a crank or connectingrod; although such may be employed if so desired, without departing from the scope of my invention.

A further object is to provide a clothcutting machine with an improved means for oiling the various movable parts through an oil-channel formed in the vertical power t( or armature)` shaft connecting with lateral channels leading to the various nate much of the vibration resulting fromL the reciprocation of the knife and driving-v arm.

A further object is to provide improved means for inelosing the complete drivingmechanism in an oil and dust-proof case,

whereby the oil will be retained in said case and the dust and dirt of the external atmosphere will be excluded therefrom, and all vportant and well-known features.

Patented J une 5, 1917.

s clothing getting caught in the mechanism will be 'entirely avoided. l

Further objects and advantages of my invention will hereinafter appear and be particularly defined in the appended claims.

In the drawings:

Figure l vis a side-elevation of a clothcutting machine embodying my invention.

Fig. 2 is a vertical section of the dustproof transmission-case at the lower end of the electric-motor casing, and showing the contained mechanism on an enlarged scale.

Fig. 3 is a vertical section of my improved mechanical-movement, employed in converting the rotary motion of the motor into a reciprocating motion.

Fig. 4 is a detail horizontal-section of the knife-driving arm vand its attached knifein cross-section, the section being taken on Fig. 7 is a detail-view of an' adjusting device, made use of in the present form of the machine, and

Fig. 8 is an enlarged vertical section of the standard, and a portion of the base, and showing kthe knife in side-elevation.

l-n carrying out the present form of my invention, I provide a common electric-motor, represented by the-numeral l, and having the usual outer .casing and other ulsigimaid motor is placed with its armature-shaft 2 in a vertical position, as shown more clearly in Fig. 1.

Beneath the said casing of the electricmotor l, and attached to the latter by means of screws 3, is the dust-proof transmissioncase 2, from'which projects the usual horizontal handle p The' numeral 5 indicates the combined standard and knife-guide, the upper end of which is provided with a horizontal flange 6, by means of which the said standard is secured to the under surface of the said transmission-case 2a by means of screws 7.

The lower end of said standard 5 is provided with a horizontal ange 8, through which suitable screws 9 are passed, to secure said standard in position upon the base 10.

The numeral 11 indicates the knife, which Vis of the usual construction and is mounted to reciprocate in the said combined standard and knife-guide 5.

A slot 12 in the base 10 permits the lower end of said knife to pass downwardly a sufficient distance.

The usual toe-plate 13 is detachably secured to the upper surface of said base by means of suitable screws 14, at the edge of the said knife-guide.

In carrying out my invention, I preferably make use 'of a safety-presser-foot rod 15, 'which carries at its lower end the usual presser-foot 16, and is built soclose to the said knife 11 as to make said knife practically danger-proof.

Suitable guide-lugs 17 and a knurled screw 18 are provided for guiding and adjusting the said presser-foot rod.

The said armature-shaft 2 passes through r a central opening formed in the lower end of the casingfof the said electric motor 1, and within said opening is located a common ball-bearing mechanism 20 for the said shaft at that point. l

Said ball-bearingv 20 is provided with a locking-wing 21 controlled by a suitable cap-screw 22, for securely holding and lock ing the adjustable sleeve 23 of said bearing, after the latter has been adjusted.

The said locking-wing is formed by cutting or sawing a slit 24 in one side of the bearing-case. (See Fig. 3).

Fixed upon the lower portion of said armature shaft, 2, by any suitable means, such as a set-screw 25, is a revoluble body of metal 26, having a threaded shank 27 upon which latter is mounted the adjustable-section 28 of a ball-bearing.

The said revoluble body of metal 26, in

'f connectionrwith the said adjustable section 28, thus provides a common ball-race in which are located the balls 29.

Furthermore, the said body of metal 26" and the said adjustable section 28 thus provide what may be termed an annular grooveV at the periphery of the said parts.

A very important portion of my invention will now be brought out, and that is the fact that the walls of the said annular groove at the outer periphery of the said parts 26 and 28, are located in a plane at an acute angle relative to the axis vof the said armature shaft 2, whereby when the said parts are rotated the walls of the said groove will wabble; in other words, I thereby provide a wabbling-groove.

Encircling the said body 26 and they said adjustable section 28, and inclosing the said wabbling-groove (which I will designate by the numeral 30), is a wabbling-ring or yoke 31 having upon its inner periphery a groove or ball-race 32.

Said balls 29, or other suitable projections, proj ect from the said walls of the said wabbling-groove 30 to the walls of the groove 32 of the said vring or yoke 31, and

. thereby connect the said ring or yoke to the said revoluble parts carried by the Vlower portion of the armature shaft.

Said adjustable section 28 is provided with a locking-wing 33, controlled by a capscrew 34, for securing the said adjustable section inV position afterv same has been moved in tightening or loosening the said section with relation to the said balls 29, as required for the proper operation of the ball-bearing. v

, Formed integral with the outer face of the said wabbling ring or yoke 31 is a cylindrical-shank 35, which is loosely mounted to rock within the tubular driving-arm 36.

Every one of the parts mentioned as wabbling, and as mounted to rock, is entirely supported by the armature shaft 2, and all of them make up a rockable arm for reciprocating the knife 11.

In order to prevent rotation of the said yoke 31 and its shank 35, some suitable formof a guide is necessary, and 1 will now proceed to describe one form of such guide.

I vfix on the interior of the said dust-proof case 2a a segmental bearing 37, which is L! -shaped in cross-section, and secured to the bottom of said case by means of a screw 38.

Mounted to rock within the said segmental bearing 37 is a semicircular guidebar 39, one end of which is provided with a ring 40y which embraces the inner end of the said shank 35 of the said wabbling yoke .31, and is fixed thereon by means of a set-screw 41. (See Fig. 2).

The opposite end of the said semi-circular sists of anintegral cylindricalV shell 45 projecting at a right-angle from the said arm, and interiorly lined with a bushing 46, within which latter rocks a tubular journal, 46a.

Threaded withinY one end .of the said tubular journal 46'a is a cap-screw 47, which engages the adjacent ends of the said journal and said Xed bushing 46, and prevents said journal from sliding toward the knife 11.

The saidknife 11 is provided with the usual slotted upper end 48, and the same is clamped in the knife-holder 49 by means of a suitable sere7 50, which is threaded into the end `of said tubular ournal 46 which is opposite that in which the said screw 47 is located. (See Fig. 4).

The said knifeholder 49 is fixed to (or formed integral with) the adjacent end of the said tubular journal 46a, so that When said journal rocks in its bearing the said knife-holder will rock with it.

A vslot 5l in the bottom of the said dust- A proof case 2fL permits the said knife to Work freely up and down.

A suitable removable door or plate 52 is provided on said transmission case 2, for permitting ready access to the knife-clamp and other parts of the mechanism Within said case.

A suitable compression coil-spring 53 is mounted in a tubular casing 54 on top of the said driving-arm 36, and urges a sliding-pin 55 having a uconical outer end into contact with an adjacent bearing 56 fixed on the said knife-holder 49 at a plane above the axis of said knife-holder journal 46a, and thereby causes the back of said knife 11 to hug the back of the said standard 5, during reciprocatien of the knife.

As shown in Fig. 7, the ends of the said segmental bearing 37 are provided with slits 57 which are Vadapted to be 'closed by means of screws 58 engaging clamping-lugs 59, when it is necessary to adjust the opposite vertical Walls of the said segmental-bearing to take up Wear upon the said semi-circular guide-bar 39.

The oiling mechanism.

said dusteproof case 2a, and from thence to the various other parts of the mechanism by means of connecting channels such as that indicated by the numeral 62, which is a channel formed for the feeding of oil from the said groove of the Wabbling-yoke 31 to the interior of the said tubular driving-arm 36, and adapted to lubricate the said shank I" 35 of the said Wabbling-yoke.

The said base 10 is mounted upon the usual rolls 63, for an obvious purpose.

The operation.

The operation of the. electric motor 1 is the same as that of any. common electric motor, and need not be described, except to say that the usual connections for supplying current and light should be provided.

l/Vhen the armature-shaft 2 rotates, duramount; but said yoke cannot rotate, as it is securely held against rotation by the said semi-circular guide-bar 39, and the fixed'segmental-bearing 37.

Hoiveven-the said Wabbling-yoke 3l is free to (and does) rock with the said semicircular guide-bar 39, and thereby the said driving-arm 36 and its attached knife ii are moved in a vertical plane, and the said knife is caused to reciprocate in its guide and standard 5, so that it may cut the cloth in the desired manner.

The operation of the remaining parts of my improved mechanism is apparent to skilled mechanics, and will not be described any further herein.

I do not limit myself to the eXact construction herein shown and described, and changes may be made in the general organization as Well as in the particular construction of some component elements of my invention Without departing from the spirit and scope thereof; and While I have shown one form of a vertical motor-shaft, and mechanism for transmitting motion directly from the lower end thereof to a reciprocating knife, Vyet any other mechanism which would suggest itself to the mind of a skilled Workman Without invention, maybe Asubstituted for that herein described.

For instance, instead of the semi-circular guide-bar 39 and its segmental-bearing 37, which are herein described as a guide for the driving-arm 36 (to guide the latter in a vertical plane), any Well-known form of guide may be substituted for such elements.

Much of the lateral vibration of the AInachine is prevented by connecting the vertically-reciprocating knife to the lower end of the vertical armature-shaft, as shown and described, because the shocks produced by the momentum of said knife (at the end of its strokes) are thus transmitted endvvise to said shaft, and are almost ventirely absorbed by the heavy armature, Without any appreciable lateral vibration of the machine.

I claim:

l. A cloth cutting machine comprising a yreciprocating knife, a vertical electric motor having a vertical armature shaft, suitable casings and framing, a rockable arm for reciprocatin said knife, said arm being mounted at t e lower end of said armature shaft and entirely supportedthereby, and means carried by said shaft for rocking said arm. c

2. A cloth cutting machine comprising a reciprocating knife, a vertical electric motor having a vert-icalV armature-shaft, and casing for said motor, a transmission-case located beneath said motor casing and arranged to support said motor and its casing, a standard for supporting said trans# mission case, a base on which said standard is mounted, a rockable arm for reciprocating said knife, said arm being mounted at the lower end of said armature shaft and entirely supported thereby, and means carried by said shaft for rocking said arm.

3. A cloth cutting machinek comprising a reciprocating knife, a vertical electric motor having a vertical armature shaft, suitable casings and framing, a rockable arm yfor reciprocating said knife, bodies fiXed upon the lower portion of said armature shaft and having a wabbling-groove formed between them, balls located in said wabbling-groove and connecting said rockable arm to the said bodies, so that said rockable arm is entirely supported by the said armature shaft, and a guide for preventing said rockable arm from rotating with said shaftl while permitting said arm to rock. y

4:. A cloth cutting machine having a vertical electric motor and a vertical armature shaft, a reciprocating knife, suitable casings and framing, a rockable driving arm for reciprocating said knife, bodies fixed on the lower portion of said armature shaft and provided with inclined walls which form the walls of a wabbling-groove, said rockable driving arm also having inclined walls which form the walls of a ball-race therein, balls located in said wabblinggroove and in said ball-race and connecting said rockable arm to the said armature shaft, so that said rockable Varm is entirely supported by the lower portion of said armature shaft, a suitable Vguiding device for preventing said rockable arm from rotating with said shaft while permitting said arm to rock, and a knife-holder carried by' said rockable arm.

I 5. A cloth-cutting machine having a vertical electric-motor, the armature-shaft of which is provided with oil-channel formed in the same shaft at a point near its lower end, a body Xed upon said shaft to rotate therewith and having a wabbling-groove in its periphery, and arranged so that said transverse cil-channel of said shaft is in communication with said wabbling-groove, a rockable driving shank having an oilchannel in communication with said wabkbling-groove, means for connecting said ADOLPH RUBIN.

Witnesses i HENRY L. HIGDON, JOHN C. HIGDON.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

